2 files changed, 27 insertions, 0 deletions
diff --git a/book/examples/chapter7/Map.gf b/book/examples/chapter7/Map.gf
new file mode 100644
index 000000000..52deebb87
--- /dev/null
+++ b/book/examples/chapter7/Map.gf
@@ -0,0 +1,10 @@
+abstract Map = {
+flags startcat = Query ;
+cat
+  Query ; Input ; Place ; Click ;
+fun
+  GoFromTo   : Place -> Place -> Input ;
+  ThisPlace  : Click -> Place ;
+  QueryInput : Input -> Query ;
+  ClickCoord : Int -> Int -> Click ;
+}
diff --git a/book/examples/chapter7/MapEng.gf b/book/examples/chapter7/MapEng.gf
new file mode 100644
index 000000000..fee0b502c
--- /dev/null
+++ b/book/examples/chapter7/MapEng.gf
@@ -0,0 +1,17 @@
+concrete MapEng of Map = {
+lincat
+  Query        = {s : Str} ;
+  Input, Place = {s : Str ; p : Str} ;
+  Click        = {p : Str} ;
+lin
+  GoFromTo x y = {
+    s = "I want to go from" ++ x.s ++ "to" ++ y.s ; 
+    p = x.p ++ y.p
+    } ;
+  ThisPlace c = {
+    s = "this place" ; 
+    p = c.p
+    } ;
+  QueryInput i = {s = i.s ++ ";" ++ i.p} ;
+  ClickCoord x y = {p = "(" ++ x.s ++ "," ++ y.s ++ ")"} ;
+}